New source found from dndbeyond.com

ddb_main/node_modules/zustand/esm/traditional.mjs

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+import React from 'react';
+import useSyncExternalStoreExports from 'use-sync-external-store/shim/with-selector.js';
+import { createStore } from 'zustand/vanilla';
+
+const { useSyncExternalStoreWithSelector } = useSyncExternalStoreExports;
+const identity = (arg) => arg;
+function useStoreWithEqualityFn(api, selector = identity, equalityFn) {
+  const slice = useSyncExternalStoreWithSelector(
+    api.subscribe,
+    api.getState,
+    api.getInitialState,
+    selector,
+    equalityFn
+  );
+  React.useDebugValue(slice);
+  return slice;
+}
+const createWithEqualityFnImpl = (createState, defaultEqualityFn) => {
+  const api = createStore(createState);
+  const useBoundStoreWithEqualityFn = (selector, equalityFn = defaultEqualityFn) => useStoreWithEqualityFn(api, selector, equalityFn);
+  Object.assign(useBoundStoreWithEqualityFn, api);
+  return useBoundStoreWithEqualityFn;
+};
+const createWithEqualityFn = ((createState, defaultEqualityFn) => createState ? createWithEqualityFnImpl(createState, defaultEqualityFn) : createWithEqualityFnImpl);
+
+export { createWithEqualityFn, useStoreWithEqualityFn };

ddb_main/node_modules/zustand/esm/vanilla.mjs

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+const createStoreImpl = (createState) => {
+  let state;
+  const listeners = /* @__PURE__ */ new Set();
+  const setState = (partial, replace) => {
+    const nextState = typeof partial === "function" ? partial(state) : partial;
+    if (!Object.is(nextState, state)) {
+      const previousState = state;
+      state = (replace != null ? replace : typeof nextState !== "object" || nextState === null) ? nextState : Object.assign({}, state, nextState);
+      listeners.forEach((listener) => listener(state, previousState));
+    }
+  };
+  const getState = () => state;
+  const getInitialState = () => initialState;
+  const subscribe = (listener) => {
+    listeners.add(listener);
+    return () => listeners.delete(listener);
+  };
+  const api = { setState, getState, getInitialState, subscribe };
+  const initialState = state = createState(setState, getState, api);
+  return api;
+};
+const createStore = ((createState) => createState ? createStoreImpl(createState) : createStoreImpl);
+
+export { createStore };